CN104661735A

CN104661735A - Ejector for pressure washers and pumps

Info

Publication number: CN104661735A
Application number: CN201380050212.4A
Authority: CN
Inventors: 詹森·J·拉希
Original assignee: Briggs and Stratton Corp
Current assignee: Briggs and Stratton Corp
Priority date: 2012-08-02
Filing date: 2013-07-25
Publication date: 2015-05-27
Anticipated expiration: 2033-07-25
Also published as: US10654054B2; CN106310991A; EP2879780B1; WO2014022187A3; WO2014022187A2; EP2879780A2; AU2013296795A1; US20140037467A1; CN104661735B; US20140246517A1; US8814531B2; AU2013296795B2

Abstract

A pressure washer (110) includes a prime mover (114), a water pump (116), the water pump (116) including a pump inlet (128) for receiving fluid from a fluid source and a pump outlet (130) for supplying a pressurized primary fluid, a jet pump (200) including a primary fluid inlet (205) fluidly coupled to the pump outlet (130), a secondary fluid inlet (230), and a fluid outlet (225), and a spray gun (118) configured to be fluidly coupled to the fluid outlet (225) of the jet pump (200), the spray gun (118) including a spray gun outlet (265) having a variable effective flow area. Wherein, in operation, in a high pressure operating mode, the pressurized primary fluid flows through the jet pump (200) and exits through the fluid outlet (225) of the jet pump (205), and in a high flow operating mode, the pressurized primary fluid flows through the jet pump (200) and entrains a secondary fluid supplied through the secondary fluid inlet (230), resulting in a combined fluid flow.

Description

For the injector of pressure washer and pump

The cross reference of related application

This application claims the rights and interests of following application: be the U.S. Provisional Application of 61/679,030 in the application number submitted on August 2nd, 2012; In the U.S. Provisional Application that the application number submitted on December 21st, 2012 is 61/745,461; In the U.S. Provisional Application that the application number submitted on March 13rd, 2013 is 61/780,584; And be the U. S. application of 13/938,180 in the application number submitted on July 9th, 2013, all above-mentioned applications are incorporated in full herein by reference with it.

Technical field

The present invention generally relates to such as the pressurization of outdoor clean applications and the device of water spray.More specifically, the present invention relates to a kind of device, it is configured to such as regulate the flowing of water by changing flow rate, hydraulic pressure, the shape of stream of separating device or other characteristic of stream, so that for the performance of one of various outdoor clean up task customizing device.

Background technology

Different water injectors is used for different application.Garden hoses sprayer can be attached to garden hoses and typically comprise nozzle, the flow path of nozzle restriction water is so that for various application, such as clean window, carwash, irrigating plant etc. carry out the restriction that adjust flux flow rate and hydraulic pressure are subject to water source water being fed to garden hoses sprayer, and this may be inadequate for some application.

Pressure washer generally includes pump, to increase the application that hydraulic pressure comes for heavy dirt cleaning and resurfacing.Hydraulic pressure significantly increases relative to typical garden hoses sprayer, but the intensity that flow rate may reduce and spray is applied for some, and such as clean window and irrigating plant may be too large.

Garden hoses pressure charging system supplies water relative to family and increases hydraulic pressure, such as clean and other traditional outdoor task.But, increase by the hydraulic pressure of garden hoses supercharging the hydraulic pressure being usually less than pressure washer and increase.Demand is existed for the water injector being configured for various outdoor clean applications.Also demand is existed for " flushing " or " rinsing " ability (such as, for washing foreign material or the cleaned object of rinsing off) improving pressure washer, especially electric press cleaning machine.

Summary of the invention

One embodiment of the present of invention relate to a kind of pressure washer, and it comprises prime mover; Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area.Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump.Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

Another embodiment of the present invention relates to a kind of electric press cleaning machine, and it comprises electro-motor; For supplying power to the power line of electro-motor; Be connected to the water pump of electro-motor, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area.Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump.Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

Another embodiment of the present invention relates to a kind of pressure washer, and it comprises prime mover; Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; Jet pump; And spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area.Jet pump comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance; Have the nozzle of current limiter, wherein said nozzle fluid between primary fluid inlet and fluid issuing connects, to make the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber; By-pass line, its fluid is connected to pump discharge and mixing chamber to provide the bypass flow path walking around described nozzle; And by-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions optionally to open and close by-pass line.Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump.Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.Wherein, under operation with high pressure pattern, during described by-passing valve is in an open position and the Primary fluid flow of pressurization arrive the fluid issuing of jet pump by nozzle and bypass flow path, and wherein, under the operator scheme of high flow capacity, during by-passing valve is in the closed position.

An alternative embodiment of the invention relates to a kind of water pump, and water pump comprises the pumping mechanism for the secondary working fluid stream that pressurizes, and pumping mechanism comprises: for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; And jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing.Wherein, in operation, under first back pressure at jet pump place, realize operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump.Wherein, in operation, high throughput pattern is realized under the second back pressure that jet pump place is less than the first back pressure, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

Another embodiment of the present invention relates to a kind of jet pump, it comprises and is configured to the primary fluid inlet that fluid is connected to the primary fluid source of pressurization, be configured to the secondary fluid entrance being fluidly connected to secondary flow body source, fluid issuing, at the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance; Have the nozzle of current limiter, wherein said nozzle fluid between primary fluid inlet and fluid issuing connects, to make the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber; By-pass line, its fluid is connected to mixing chamber to provide the bypass flow path walking around described nozzle; And by-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line.Wherein said pass valve configuration becomes in response to the back pressure at jet pump place, moves between described open position and described closed position.Wherein, under first back pressure at jet pump place, during by-passing valve is in an open position, and under the second back pressure being less than described first back pressure at jet pump place, during by-passing valve is in the closed position.

Another embodiment of the present invention relates to a kind of jet pump kit utility being suitable for using together with water pump, it comprises jet pump, described jet pump comprises and is configured to fluid and is connected to the pump discharge of water pump to receive the primary fluid inlet of secondary working fluid of pressurization, be configured to fluid and be connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing, and spray gun, described spray gun comprises the lance outlet with variable valid circulation area.

Another embodiment of the present invention relates to a kind of jet pump kit utility being suitable for using together with water pump, it comprises jet pump, described jet pump comprises and is configured to fluid and is connected to the pump discharge of water pump to receive the primary fluid inlet of secondary working fluid of pressurization, be configured to fluid and be connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing, and first spray gun, described first spray gun comprises the lance outlet with the first valid circulation area, and second spray gun, described second spray gun comprises the lance outlet with the second valid circulation area being greater than the first valid circulation area.

Another embodiment of the present invention relates to a kind of pressure washer, and it comprises prime mover; Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; First spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the first spray gun has the first valid circulation area; And second spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the second spray gun has the second valid circulation area being greater than the first valid circulation area.Wherein, in operation, when the first spray gun fluid is connected to fluid issuing, first valid circulation area produces the first back pressure at jet pump place, thus realizing operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump.Wherein, in operation, when the second spray gun fluid is connected to fluid issuing, the second larger valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

Another embodiment of the present invention relates to the method changing flowing in response to back pressure, described method comprises pressure fluid is supplied to jet pump, the first back pressure is formed at jet pump place, operation with high pressure pattern is realized in response to the first back pressure, the fluid pressurizeed under this operation with high pressure pattern flows through jet pump, the second back pressure is formed at jet pump place, wherein said second back pressure is less than the first back pressure, and realize high throughput pattern in response to described second back pressure, the fluid pressurizeed under this high throughput pattern flows through jet pump and carries secondary fluid secretly, to cause the fluid stream of the merging of flowing out jet pump.

Substituting exemplary embodiment relates to the combination of further feature as usually recorded in the claims and feature.

Accompanying drawing explanation

From by reference to the accompanying drawings be described below in detail that invention will be more fully understood, wherein, identical Reference numeral refers to identical element, wherein:

Fig. 1 is the perspective view of pressure washer;

Fig. 2 is the schematic diagram of flow multiplier;

Fig. 3 A is the schematic diagram of a pressure washer part, and it comprises the flow multiplier shown in Fig. 2 and operates according to the first operator scheme;

Fig. 3 B is the schematic diagram of a pressure washer part, and it comprises the flow multiplier shown in Fig. 2 and operates according to the second operator scheme;

Fig. 4 is the front view of the nozzle being suitable for using together with the pressure washer shown in Fig. 3;

Fig. 5 is the front view of the second nozzle being suitable for using together with the pressure washer shown in Fig. 3;

Fig. 6 is the curve map from comparing with pressure with the flow that the various nozzles that the pressure washer comprising flow multiplier uses together cause;

Fig. 7 is the schematic diagram of substituting flow multiplier;

Fig. 8 is the schematic diagram of a pressure washer part, and it comprises flow multiplier and optional chemicals injected system;

Fig. 9 is the viewgraph of cross-section according to the flow multiplier along the line 9-9 of Figure 19 got of exemplary embodiment under operation with high pressure pattern;

Figure 10 is the detailed view of the multiplier of flow shown in a Fig. 9 part;

Figure 11 is the detailed view of the multiplier of flow shown in Fig. 9 another part;

Figure 12 is the viewgraph of cross-section of flow multiplier shown in the Fig. 9 under high throughput pattern;

Figure 13 is the detailed view of the multiplier of flow shown in a Figure 12 part;

Figure 14 is the schematic diagram of the spray gun according to exemplary embodiment;

Figure 15 is the schematic diagram of the spray gun according to exemplary embodiment;

Figure 16 is the schematic diagram of the spray gun according to exemplary embodiment;

Figure 17 is the schematic diagram according to the spray gun of exemplary embodiment under the first configuration;

Figure 18 is the schematic diagram of the spray gun under the second configuration shown in Figure 17;

Figure 19 is the perspective view of integrated flow multiplier according to exemplary embodiment and water pump component;

Figure 20 is the perspective view of the electric press cleaning machine according to exemplary embodiment; And

Figure 21 is the perspective view of the pressure washer part according to exemplary embodiment.

Detailed description of the invention

Before reading is shown specifically the accompanying drawing of exemplary embodiment, should be understood that, the application is not limited to details mentioned or shown in the accompanying drawings in the description or method.It is to be further understood that the object that term is only used to describe and should not be considered to be restrictive.

With reference to Fig. 1, pressure washer 110 comprises the framework 112 supporting prime mover 114 (such as explosive motor), and be configured to be connected to and there is conveyance conduit 120 (such as, high-pressure hose) spray gun 118 water pump 116 (such as, positive-displacement pump, piston pump, axial cam pump).In other embodiments, electro-motor is used as prime mover 114.In certain embodiments, prime mover 114 is fastened to the top of framework 112 base plate 122, and water pump 116 is installed to the below of base plate 122 and is connected to the Power output of prime mover 114 through the hole of base plate 122.In other embodiments, water pump is directly connected to engine or prime mover and is supported by engine or prime mover.Water pump 116 connects (such as, directly connect, indirectly connected by transmission system, belt, gear or other drive system) to prime mover 114 to be driven by prime mover 114.In certain embodiments, pressure washer 110 is of portable form and comprises wheel 124 and handle 126.In other embodiments, pressure washer 110 can be fixing.In other embodiments, pressure washer 110 is installed to trailer or other vehicle.Water pump 116 comprises pump intake 128 and pump discharge 130.Pump intake 128 is configured to be connected to supply line or flexible pipe, and supply line or flexible pipe are connected to again fluid supply portion (such as, being connected to the sleeve pipe of municipal water supplies or well).In certain embodiments, pump intake 128 comprises the low pressure garden hoses formula joint for garden hoses being connected to pump intake 128.Pump discharge 130 comprises for pump discharge 130 being connected to conveyance conduit 120 or comprising the high pressure connection (such as, M22 joint) of other device of suitable high pressure connection.As shown in fig. 1, pressure washer 110 uses vertically shafted engine.According to a substituting embodiment, prime mover can be horizontal-shaft engines.

With reference to Fig. 2, flow multiplier is shown, flow inducer, entrainment device, injector, jetting device, or jet pump 200.The function of flow multiplier 200 provides at least two kinds of operator schemes to pressure washer 110: high pressure mode and high flow rate mode." flow " refers to volume flow rate, and usually measures with gallons per minute (" gpm ").Flow multiplier 200 comprises the primary fluid inlet 205 that fluid is connected to pump discharge 130, in restriction or the coarctation segment 210 in primary fluid inlet 205 downstream, at the secondary working fluid nozzle 215 in coarctation segment 210 downstream, there is the mixing chamber 220 of fluid issuing 225, and the secondary fluid entrance 230 be communicated with mixing chamber 220 fluid.Primary fluid inlet 205 directly can be connected to pump discharge 130 or long-rangely be connected to pump discharge 130 (such as, by pressure piping or flexible pipe).

With reference to Fig. 3 A-Fig. 3 B, primary fluid inlet 205 is configured to be connected to pump discharge 130 (such as, passing through high pressure connection), and allows secondary working fluid to enter flow multiplier 200.Alternatively, primary fluid inlet 205 can be connected to the high-pressure side of water pump 116, but still is in the housing of water pump 116.Such as, fluid intake 205 can flow out from pumping mechanism the pump discharge 130 that arrives pumping mechanism with pumping mechanism (such as, one or more pump piston), fluid or pump manifold built-in (inline) arranges and is in the downstream of pumping mechanism, pump discharge 130 or pump manifold.Flow multiplier 200 can be arranged at upstream or the downstream of feather valve, and feather valve is arranged in water pump 116.When the fluid flowed from pump discharge 130 stops (such as, when stopping from the flowing of spray gun 118), feather valve allows fluid to be recycled to low-pressure side from the high-pressure side of pump 116.Coarctation segment 210 connects primary fluid inlet 205 and nozzle 215.The diameter of coarctation segment 210 is reducing from primary fluid inlet 205 to the fluid flow direction of nozzle 215.Nozzle 215 extends in mixing chamber 220, and comprises the jet expansion 235 being positioned at mixing chamber 220.

Secondary fluid entrance 230 allows secondary fluid to enter in mixing chamber 220.Secondary fluid entrance 230 fluid is connected to fluid supply portion.In a preferred embodiment, secondary fluid entrance 230 and pump intake 128 share common fluid supply portion (such as, garden hoses sleeve pipe or inlet tubes).In certain embodiments, secondary fluid entrance 230 comprises the garden hoses formula joint of low pressure.In other embodiments, entrance 230 is derived from the three-way connection 255 being arranged at pump upstream, and it from the flowing shunting of water source (such as, being connected to the sleeve pipe of municipal water supplies or well) or will be divided into two tributaries.First tributary is supplied to pump intake 128, and the second tributary is supplied to secondary fluid entrance 230.In some operating modes, Secondary fluid flow enters in mixing chamber 220 by secondary inlet 230, in mixing chamber 220, secondary fluid is entrained with the secondary working fluid at outlet 235 mass flowing nozzle 215, thus results through the fluid stream that fluid issuing 225 flows out the merging of flow multiplier 200.In certain embodiments, fluid issuing 225 comprises high pressure connection.

With reference to Fig. 3 A and Fig. 3 B, a part for the pressure washer 110 comprising flow multiplier 200 is shown.Primary fluid inlet 205 fluid is connected to pump discharge 130.According to exemplary embodiment, pump discharge 130 provides and is forced into 3000 pound per square inches (" psi ") and flow rate is the water of 2.5gpm.The conventional high-tension water pump used in Multifunctional pressure cleaning machine can be used in, such as Annovi Reverberi RMW series pump.Supply line 240 (such as, low-pressure hose) fluid is connected to pump intake 128 and fluid supply portion 245.In certain embodiments, fluid supply portion 245 is municipal water supplies or well.Secondary fluid pipeline 250 (such as, lower pressure flexible pipe) fluid is connected to secondary fluid entrance 230.Secondary fluid pipeline 250 is connected to supply line 240 by three-way connection 255 fluid, is connected to fluid supply portion 245 to make secondary fluid pipeline 250 fluid.In certain embodiments, three-way connection 255 is positioned at pump intake 128 place.In other embodiments, three-way connection or breeches joint are arranged on fluid supply portion, and another outlet fluid that an outlet fluid of its center tap is connected to supply line 240 and joint is connected to secondary fluid pipeline 250.In certain embodiments, three-way connection 255 comprises check-valves, in case fluid flows towards fluid source.Check-valves 260 is located along secondary fluid pipeline 250, and to prevent from flowing backwards, that is, anti-fluid flows from mixing chamber 220 towards fluid supply portion 245.For flow multiplier 200 place higher than threshold pressure back pressure for, check-valves 260 cuts out, and will provide the low-flow fluid stream of relatively high force from spray gun 118.For flow multiplier 200 place lower than threshold pressure back pressure for, check-valves 260 is opened, and will provide the high flow capacity fluid stream of relatively low pressure from spray gun 118.Conveyance conduit 120 (such as, high-pressure hose) fluid is connected to fluid issuing 225.Spray gun 118 fluid is connected to the opposed end of conveyance conduit 120.

With reference to Fig. 3 A-Fig. 5, spray gun 118 comprises at least two modifiable, changeable or interchangeable nozzles 265 and 270.As shown in Figure 4, first jet 265 have be suitable for produce relatively high force low-flow fluid stream (such as, be 3000psi under 2.5gpm for Pneumatic pressure cleaning machine, be 1700psi under 1.3gpm for electric press cleaning machine) the first valid circulation area 275 (such as, diameter or cross-sectional area).As shown in Figure 5, second nozzle 270 have be greater than the first circulation area 275 the second valid circulation area 280 (such as, diameter or cross-sectional area), and be suitable for produce relatively low pressure high flow capacity fluid stream (such as, be 450psi under 5.0gpm for Pneumatic pressure cleaning machine, be 150psi for electric press cleaning machine under 4.5gpm).The low-flow fluid stream of the high pressure produced by first jet 265 can be atomized immediately or shortly after fluid stream leaves first jet 265.The low-flow fluid stream of high pressure is suitable for pressure wash application, as from deck, garden, fence or other surface or structure remove chip, dust, dirt, mould etc.The high flow capacity fluid stream of the low-pressure produced by second nozzle 270 substantially keeps its shape for second nozzle 270 for sizable distance.The high flow capacity fluid stream of low-pressure can transmit the coherent of quite large distance or concentrated stream from spray gun 118.In certain embodiments, this second nozzle 270 comprises flow adjustment element (such as, fluid is by multiple PARALLEL FLOW pipelines of its flowing) to improve the continuity of stream.This kind of flow adjustment element is to submit on April 23rd, 2009 and with the application number of US 2010/0270402 announcement for 12/429, described by having in the U.S. Patent application of 028, this application is incorporated to herein by introducing in full with it.The high flow capacity fluid stream of low-pressure is suitable for carrying out in a distance rinsing or low pressure cleans.Such as, the high flow capacity fluid stream of low-pressure can be used for clean second floor window, washes out honeycomb from tree or eaves, or by suitable gutter cleaning attachment, cleans out a drain when user still stands on the ground.Trigger on spray gun 118 is flowed by the fluid of spray gun 118 for stopping and starting.

In certain embodiments, at least two nozzles 265 and 270 are difference settings of spray gun 118, and can be selected by screwing, pressing or otherwise moving (such as, turntable type nozzle) between position by user.In other embodiments, select independent nozzle 265 or 270 and be attached to spray gun by joint (such as, fast connecting joint).In other embodiments, each nozzle is the parts of unique spray gun, makes the first spray gun comprise nozzle 265 and the second spray gun comprises nozzle 270.In other embodiments, can to single-nozzle (such as, variable-nozzle) carry out regulating (such as, by screwing, press or otherwise moving) to adjust the size of the valid circulation area of single-nozzle, thus the multiple setting being equivalent to above-mentioned at least two nozzles 265 and 270 is provided.

In use, water pump 116 is pumped across secondary working fluid that pump intake 128 receives and is exported by secondary working fluid by pump discharge 130 with the pressure increased, thus, the secondary working fluid pressurizeed is formed owing to being present in the current limliting (such as, by the nozzle of current use and/or the current limliting of other components downstream formation) in pump discharge 130 downstream.In certain embodiments, water pump 116 can form the pressure up to 500 pound per square inches (" psi "), or in other embodiments, can form the pressure of 5000 pound per square inches (" psi ") or more.In certain embodiments, water pump 116 can be formed in the pressure within the scope of 1000-5000psi, preferably 1500-4000psi.In certain embodiments, water pump 116 can form the pressure of 100psi or larger.

As shown in Figure 3 B, for high throughput pattern, select high flow capacity or second nozzle 270 at spray gun 118 place.The secondary working fluid of pressurization is provided to flow multiplier 200 by water pump 116.Secondary working fluid enters in flow multiplier at entrance 205, and is subject to the restriction of coarctation segment 210 and nozzle 215.Secondary working fluid continues through nozzle 215 and leaves outlet 235 and enters in mixing chamber 220.Secondary working fluid produces vacuum or low-pressure area (such as, by Bernoulli Jacob or Venturi effect, or the combination of the two) by being flowing in mixing chamber of mixing chamber 220.Pressure reduction between secondary fluid in low-pressure area and secondary fluid pipeline 250 and/or vacuum or low-pressure area is enough to open check-valves 260, and secondary fluid is incorporated in mixing chamber 220 by secondary fluid entrance 230.Once enter in mixing chamber 220, secondary fluid is carried secretly by secondary working fluid, thus significantly increases the volume of flowing compared with the secondary working fluid of himself.The fluid of this merging flows through fluid issuing 225 and leaves mixing chamber 220 and be advanced through conveyance conduit 120 and arrive spray gun 118.The fluid stream merged leaves spray gun 118 as the high flow capacity fluid stream (compared with operation with high pressure described below) of low-pressure by second nozzle 270.In certain embodiments, the valid circulation area of secondary working fluid nozzle 215 is less than the valid circulation area 280 of high-flow nozzles 270.

As shown in fig. 3, for operation with high pressure pattern, select high pressure or first jet 265 at spray gun 118 place.The first relatively little circulation area 275 limit fluid flows through first jet 265, and forms back pressure in jet pump place 200 (such as, in mixing chamber 220).This back pressure controls or overcomes low-pressure area, otherwise low-pressure area will be formed by leaving the primary of high voltage fluid that nozzle 215 flows, and secondary fluid can not be entered in mixing chamber 220.Check-valves 260 also will cut out under operation with high pressure pattern.Secondary working fluid leaves mixing chamber 220 by fluid issuing 225 and is advanced through conveyance conduit 120 and arrives spray gun.Secondary working fluid leaves spray gun 118 as the low-flow fluid stream (compared with above-mentioned high throughput) of elevated pressures by first jet 265.In certain embodiments, the valid circulation area (such as, diameter or cross-sectional area) of secondary working fluid nozzle 215 is greater than the valid circulation area 275 of high pressure nozzle 265.

Also changed thus by the nozzle changing spray gun 118 and carry out select operating mode in the back pressure of flow multiplier 200 place (such as, in mixing chamber 220).User can by carry out simply switching between high flow capacity and operation with high pressure pattern fast and easily change between suitable nozzle.Do not need the switch at adjustment pressure washer main body place, rotating disk or other interface.Multiple operation with high pressure pattern and multiple high throughput pattern are possible, and wherein often kind of operator scheme is associated from the different spray nozzles with different valid circulation area.

With reference to Fig. 6, for four kinds of different low-pressure high-flow nozzles (285,290,295,300), high pressure low-volume nozzle and do not have the situation of nozzle, applicant tests, to compare exporting from the fluid pressure of pressure washer spray gun and flow that comprise flow multiplier.In order to the impact of test traffic multiplier, develop a kind of test macro, it allows the fluid leaving water pump flow through flow multiplier or walk around flow multiplier.The measurement of flow rate and hydraulic pressure is carried out in the downstream of flow multiplier.When not running when not having nozzle, water pump and walk around flow multiplier (making do not have fluid to flow through flow multiplier), fluid exports as 0.57gpm.Do not run when there is no nozzle, water pump but use traffic multiplier, fluid exports as 2.45gpm.When do not have nozzle, water pump operation and walk around flow multiplier, fluid exports as 2.8gpm.When do not have nozzle (data point 305), water pump operation and use traffic multiplier, under 120psi, fluid exports as 5.6gpm.When there is no nozzle and water pump operation, adding flow multiplier and making flow rate be doubled to 5.6gpm from 2.8gpm.When have nozzle 285, water pump operation and use traffic multiplier, under 170psi, fluid exports as 4.7gpm.When there is nozzle 290 water pump operation and use traffic multiplier, under 185psi, fluid exports as 4.1gpm.When have nozzle 295, water pump operation and use traffic multiplier, under 188psi, fluid exports as 3.8gpm.When have nozzle 300, water pump operation and use traffic multiplier, under 190psi, fluid exports as 3.35gpm.At conventional high-tension nozzle, water pump operation when walking around flow multiplier (such as, test macro is as the operation of traditional pressure washer), fluid exports as 2.5gpm under 2500psi.Fig. 6 illustrates by applicant's high-flow nozzles (285 for four kinds of different low-pressures on the pressure washer 110 comprising flow multiplier 200,290,295,300) flow (in units of gpm) and without the situation of nozzle (305) carrying out testing is to the curve map of pressure (psi).Theoretically, flow multiplier 200 provides fluid to export, infinitely change between its minimum discharge pattern at maximum pressure and maximum stream flow pattern of minimum pressure, as the circulation area by changing spray tip control, wherein maximum pressure and flow are determined by the prime mover 114 selected for using in pressure washer 110 and pump 116.

The parts that flow multiplier 200 can be used as pressure washer 110 are included, parts as water pump 116 are included, parts as the flow multiplier kit utility allowing user's modified pressure cleaning machine are included, and can be incorporated in spray gun 118, or with other suitable mode commercialization.In certain embodiments, flow multiplier kit utility comprises flow multiplier 200 and spray gun 118.Lance outlet has variable valid circulation area (such as, multiple nozzle can be embedded in spray gun 118, turntable comprises multiple nozzle, there is the single-nozzle of variable valid circulation area), or kit utility comprises multiple spray gun, wherein each spray gun has different valid circulation area, selects between operation with high pressure pattern and high throughput pattern to allow user.Kit utility also can comprise high flow capacity flexible pipe or pipeline 120.Conveyance conduit 120 included in many conventional pressure cleaning machines is high-pressure hoses of 1/4th inches.In order to correctly adapt to the flow of the increase provided by flow multiplier, high flow capacity pressure hose or conveyance conduit 120 (such as, the high-pressure hose of 3/8ths inches) are preferred.In certain embodiments, the high-pressure hose of 1/4th inches is used as conveyance conduit 120.In certain embodiments, kit utility can comprise two flexible pipes or pipeline (that is, high flow capacity pipeline and pressure piping).

In certain embodiments, jet pump is used as flow multiplier.The jet pump of a type shown in Fig. 2.The jet pump 315 of another kind of type shown in Fig. 7.Jet pump 315 be similar to above with in fig. 2 shown in those parts identify with identical Reference numeral.Jet pump 315 is also included in the convergence type cone 320 in secondary fluid entrance 230 downstream.Convergence type cone 320 limits entrapment areas.Mixing chamber 220 comprises mixed zone 325 and the divergence expression cone 330 of constant diameter, and fluid flowed through this divergence expression cone 330 before arrival fluid issuing 225.

As those skilled in the art think, jet pump be used as flow multiplier be best.But Venturi tube can be used as flow multiplier.An advantage of jet pump be with commercially available variable flow rate fluid pump (such as, variable displacement is provided or with the mechanical fluid pump of other method alter flow rate) compare, it comprises less moving-member, and in certain embodiments, does not have moving-member.Another advantage of jet pump is that it uses the secondary working fluid of relatively small size to carry the secondary fluid of relatively large volume secretly, causes the merging fluid of the relatively large volume formed primarily of secondary fluid.Venturi tube uses the secondary working fluid of relatively large volume to carry the secondary fluid of relatively small size secretly, causes the merging fluid of the relatively large volume formed primarily of secondary working fluid.Such as, the Venturi tube in carburetor uses the air of relatively large volume to carry secretly the fuel of relatively small size, to form the air-fuel mixture of mainly air.In certain embodiments, vane drive formula pump (such as, turbocharger) is as flow multiplier.Blade or impeller to be positioned in flow of pressurized fluid and for driving pump to supply secondary fluid.Turbocharger can be inputted (such as, switch) or optionally activate in response to the pressure reduction (such as, changing the pressure change caused in response to the valid circulation area by spray tip) in pressure washer system somewhere by user; Otherwise turbocharger can dally simply, do not provide additional flowing.Alternatively, turbocharger is positioned in bypass flow path, and when without the need to additional flow, the fluid stream of pressurization does not flow through bypass flow path.When turbocharger activated (such as, as described above), flow of pressurized fluid is guided through bypass flow path by valve at least partially, and arrives turbocharger to provide additional flowing.In certain embodiments, when turbocharger activated, whole flow of pressurized fluid is all conducted through bypass flow path.In other embodiments, when turbocharger activated, a part for flow of pressurized fluid is conducted through bypass flow path.In other embodiments, flow multiplier uses the kinetic energy of first fluid stream to carry secretly or the structure of pumping second fluid stream.

Flow multiplier 200 authorized pressure cleaning machine 110 provides the flowing of high volume or " supercharging ", and need not carry out mechanical alteration to water pump 116.Typically, in order to increase the flowing from water pump 116, such as by needs by increasing piston stroke, changing pumpage, or with higher speed operation pump, mechanical alteration is carried out to pump.For this reason, under different flowings, operate water pump 116 needs to change the ability of water pump 116 being carried out to mechanical alteration, such as, mechanically changes piston stroke, mechanically changes discharge capacity, or with different speed operation pumps.Flow multiplier 200 eliminates mechanical complexity, otherwise under different flows exports, operates the water pump 116 of pressure washer 110 by needing by using the pressure fluid from water pump 116 to export to respond the fluid flow formed from the change of flow multiplier 200 of the back pressure from spray gun 118 to export.As compared to other variable flow pump (such as, variable displacement, stroke changeable, variable velocity etc.), single flow water pump (such as, water pump 116) and flow multiplier 200 can provide cost savings.Back pressure from spray gun 118 can easily change by changing the valid circulation area of lance outlet.This makes user pass through to change simply the valid circulation area (such as, by changing nozzle, regulate adjustable nozzle, or change spray gun) of lance outlet easily to change between high flow capacity and operation with high pressure pattern.Alternatively, the adjustable current limiter of user (such as, valve, rotating disk etc.) can be arranged at the downstream of flow multiplier 200, to change the back pressure at flow multiplier 200 place, thus change between high throughput pattern and high pressure operation pattern.

With reference to Fig. 8, a part for the pressure washer 110 comprising flow multiplier 200 is shown.Fig. 8 illustrates the bypass 345 of two optional chemicals injected systems 335 and 340 and the optional differential pressure actuated around flow multiplier 200.

Optional chemical systems 335 comprises the holder 350 being connected to secondary fluid pipeline 250 by pipeline 355 and valve 360 fluid.Holder 350 comprises chemicals, such as soap, washing agent, clear spot purificant, herbicide, glazing agent etc.Valve 360 is two flow dividers, it allows user to select " chemicals " pattern and "Off" mode, under " chemicals " pattern, chemical flow is allowed to arrive secondary fluid entrance 230 by valve 360 and stop Secondary fluid flow passing through valve 360, and under "Off" mode, allow Secondary fluid flow by valve 360 and stop chemical flow passing through valve 360.Alternatively, in the embodiment comprising three position valve, secondary fluid is allowed to mix with the chemicals stream under chemicals pattern or " mixed mode ".Current limiter 365 (such as, measuring aperture) is located between holder 350 and valve 360 along pipeline 355.Current limiter 365 limits the flow that chemicals flows from holder 350.In use, under high throughput pattern, use nozzle 270 and use valve 360 under chemicals pattern, the low-pressure area in mixing chamber 220 and the pressure reduction between holder 350 cause chemicals to flow to secondary fluid pipeline 250 from holder 350.Chemicals stream is entrained in mixing chamber 220 by secondary working fluid, thus the merging fluid stream comprising secondary working fluid and chemicals is supplied to spray gun 118.In certain embodiments, check-valves is positioned in pipeline 355, to prevent Secondary fluid flow in holder 350.

Optional chemical systems 340 comprises the holder 370 being connected to secondary fluid pipeline 250 by pipeline 375 and Venturi tube 380 fluid.Holder 370 comprises and will be added to the chemicals of secondary fluid.On/off valve 385 is positioned between holder 370 and Venturi tube 380 along pipeline 375 and also can moves between " connection " position and " cut out " position, in " connection " position, pipeline 375 is open, and in " closedown " position, pipeline 375 is closed.Alternatively, valve 385 is variable to allow user's metering from the chemicals stream of holder 370.Check-valves 390 is positioned between on/off valve 385 and Venturi tube 380 along pipeline 375, to prevent from flowing backwards from Venturi tube 380 towards holder 370.In use, under the high throughput pattern in on/off valve 385 is in an open position, secondary fluid produces Venturi effect by the flowing of Venturi tube 380, and chemicals is aspirated through pipeline 375 by it, mixes with secondary fluid stream to make chemicals.Then, this mixed flow of secondary fluid and chemicals is entrained in mixing chamber 220 by secondary working fluid stream, thus will comprise secondary working fluid, secondary fluid, and the merging fluid stream of chemicals is supplied to spray gun 118.In certain embodiments, chemical systems 335 and 340 comprises one or more additional storage, and additional storage comprises the chemicals being different from the first holder.User can select between holder by activating the selector valve fluid of holder being connected to suitable supply line.

If under operation with high pressure pattern, optional differential pressure actuated bypass 345 can be necessary, and flow multiplier 200 makes pressurization secondary working fluid stream be subject to unacceptable energy loss, and is subject to unacceptable loss from the output pressure of spray gun 118.If this is genuine, then differential pressure actuated bypass 345 allows a part for pressurization secondary working fluid stream to walk around flow multiplier 200 in operation with high pressure pattern.Differential pressure actuated bypass 345 comprises the pipeline 395 that is communicated with conveyance conduit 120 fluid with water pump 116 partly to walk around flow multiplier 200 and differential pressure activated valve 400 (such as, needle-valve and seat valve).Under piston in valve 400 is usually in an open position.In use, under high throughput pattern, produce relatively large pressure reduction by valve 400, namely, the secondary working fluid stream of the merging fluid stream of the relative lower pressure in by-pass line 395 exit and the relative high pressure in by-pass line 395 porch, this can make 400 valves close.In use, under operation with high pressure pattern, relatively low (namely by the pressure reduction of valve 400, the secondary working fluid stream of the relative high pressure at by-pass line 395 entrance and exit place) and controlled by spring, cause valve 400 to be opened, thus allow the secondary working fluid stream of pressurization to walk around flow multiplier 200 by pipeline 395.In use, under high throughput pattern, valve 400 cuts out.

With reference to Fig. 9-13, flow multiplier or jet pump 500 are shown.Many characteristic sum purposes of jet pump 500 are similar to above for those described by flow multiplier 200.Jet pump 500 comprises main body 502, primary fluid inlet 505, be included in the secondary working fluid nozzle 510 of the secondary working fluid current limiter 515 in primary fluid inlet 505 downstream, mixing chamber 520, at the fluid issuing 525 in mixing chamber downstream, and fluid is connected to the secondary fluid entrance 530 of mixing chamber 520.Primary fluid inlet 505 leads to the secondary working fluid chamber 535 being positioned at secondary working fluid nozzle 510 upstream.Outlet conduit 540 is between mixing chamber 520 and fluid issuing 525.Outlet conduit 540 limits the exit passageway 542 comprising end difference 545, increases at the diameter of end difference 545 place exit passageway 542.Annular compartment 550 is formed between the outer surface and a part for main body 502 of outlet conduit 540.Primary fluid inlet 505 fluid is connected to the position in secondary working fluid nozzle 510 downstream by by-pass line 555.As shown in the figure, secondary working fluid chamber 535 fluid is connected to annular compartment 550 by by-pass line 555.By-passing valve 560 is arranged in by-pass line 555 optionally to open and close by-pass line 555.Chemical inlet 565 is positioned at the downstream of mixing chamber 520.

Jet pump 500 is configured in response to the back pressure (such as, in the back pressure at fluid issuing 525, mixing chamber 520, secondary working fluid nozzle 510 place) at place of jet pump place 500 with the operation of one of two kinds of different patterns (high pressure mode and high flow rate mode).When back pressure is higher than threshold pressure or pressure limit, realize high pressure mode.When back pressure is lower than threshold pressure or pressure limit, realize high flow rate mode.Back pressure at place of jet pump place 500 is formed by limiting the flowing in jet pump 500 downstream.Such as, as will be discussed in more detail below, the back pressure at place of jet pump place 500 controls by the valid circulation area changing pressure washer spray gun.The spray gun comprising the nozzle with relatively little valid circulation area forms relatively high back pressure by place of jet pump place 500, thus realize operation with high pressure pattern, and the spray gun comprising the nozzle with relatively large valid circulation area forms relatively low back pressure by jet pump 500 place, thus realize high throughput pattern.

Primary fluid inlet 505 is configured to be connected to pressurization primary fluid source (such as, pump discharge 130).In certain embodiments, primary fluid inlet 505 is configured to directly be connected to pump discharge 130.In other embodiments, primary fluid inlet 505 and/or jet pump 500 form (such as, as single global facility) with water pump 116.In other embodiments, primary fluid inlet 505 is configured to indirectly be connected to pump discharge 130 (such as, by high-pressure hose or pipeline).Secondary fluid entrance 530 is configured to fluidly be connected to fluid source (such as, municipal water supplies or well).In certain embodiments, secondary fluid entrance 530 is configured by low-pressure hose or pipeline (such as, being connected to the garden hoses of sleeve pipe) fluid is connected to fluid source.In a preferred embodiment, secondary working fluid and secondary fluid are aspirated from same source.Such as, the secondary fluid entrance 530 of pressure washer 110 pump intake 128 and jet pump 500 is connected to identical sleeve pipe (such as, by garden hoses and three-way connection 815).Secondary fluid is supplied to mixing chamber 520 by secondary fluid entrance 530.

As shown in Figure 9, under operation with high pressure pattern, pressurization secondary working fluid enters jet pump 500 via primary fluid inlet 505.Pressurization secondary working fluid first-class or flowing (shown in the arrow in Fig. 9) flow through secondary working fluid chamber 535 and by secondary working fluid nozzle 510.Second or the flowing (shown in the arrow in Fig. 9) of pressurization secondary working fluid flow through secondary working fluid chamber 535, the position in secondary working fluid nozzle 510 downstream is arrived (such as by by-pass line 555, opening 600), recombine, to form the high-pressure fluid stream reconsolidated or the flowing (shown in the arrow in Fig. 9) of being flowed out the pressurization secondary working fluid of jet pump 500 by fluid issuing 525 in this position second or flowing and the first-class of secondary working fluid of pressurizeing.As shown in the figure, the first-class secondary working fluid nozzle 510 that leaves of pressurization secondary working fluid arrives mixing chamber 520, and flow through exit passageway 542 from mixing chamber 520, the high-pressure fluid stream reconsolidated of the secondary working fluid that pressurizes is recombined at the first-class of this exit passageway place pressurization secondary working fluid and the second of pressurization secondary working fluid.The second of pressurization secondary working fluid flows through by-pass line 555 and arrives annular compartment 550, then by annular compartment 550 fluid being connected to one or more passage or the opening 600 of exit passageway 542, this one or more passage or opening part pressurization secondary working fluid second with pressurization secondary working fluid the first-class stream reconsolidated recombining into the secondary working fluid that pressurizes.

Under operation with high pressure pattern, by jet pump 500 downstream parts (such as, spray gun, spray tip etc.) caused by jet pump place 500 (such as, in mixing chamber 520) back pressure at the place low-pressure area that controls or overcome in mixing chamber 520, otherwise low-pressure area can be formed by the primary of high voltage fluid stream leaving nozzle 510, thus prevents secondary fluid from entering mixing chamber 520.Under operation with high pressure pattern, be closed at the check-valves 557 of secondary fluid entrance 530 place or its upstream.In certain embodiments, under operation with high pressure pattern, the secondary fluid of trace can enter mixing chamber 520.

By-pass line 555 guarantees that jet pump 500 provides the acceptable flowing of pressure fluid under operation with high pressure pattern.When not having by-pass line 555, all pressurization secondary working fluid will flow through current limiter 515, and in certain embodiments, this may cause unacceptable pressure drop in the flow of pressurized fluid of carrying from jet pump 500.By-passing valve 560 moves between open position (Fig. 9 and Figure 10) and closed position (Figure 12 and Figure 13), to be applied to the fluid force on piston 567 surface, the pressure reduction by by-passing valve 560 in response to by pressurization secondary working fluid, and/or bias force (such as, from spring 575) optionally opens and closes by-pass line 555.As shown in figs. 9 and 10, under operation with high pressure pattern, by the pressure reduction of by-passing valve 560 and/or make valve move to open position by spring 575 applied force, allow pressurization Primary fluid flow by by-pass line 555 thus.As shown in figure 12 and figure 13, under high throughput pattern, be applied to the fluid force on piston 567 surface by pressurization secondary working fluid and/or made valve move to closed position by the pressure reduction of by-passing valve 560, thus preventing pressurization Primary fluid flow by by-pass line 555.Under operation with high pressure pattern, by the pressure reduction of by-passing valve 560 lower than threshold value pressure reduction (such as, the pressurization secondary working fluid stream of pressure reduction at secondary working fluid chamber 535 place and relatively little between the pressurization secondary working fluid stream at exit passageway 542 place), and under high throughput pattern, by the pressure reduction of by-passing valve 560 higher than threshold pressure (such as, the pressurization secondary working fluid stream of pressure reduction at secondary working fluid chamber 535 place and relatively high between the merging fluid stream at exit passageway 542 place).

By-passing valve 560 comprises moveable piston 567, valve seat or pivot 570, and spring or biasing member 575.Piston 567 is included in the opening 580 of piston 567 upstream side and the chamber 585 on piston 567 downstream.In certain embodiments, opening 580 has the diameter being less than chamber 585.The size and dimension of chamber 585 is customized to for receiving valve seat 570, to make valve seat 570 contact or engage one or more surface of restriction chamber 585 when piston 567 is in the closed position, in case fluid flows through piston 567, thus close by-passing valve 560.Time in the open position, piston 567 moves away from valve seat 570, and by-passing valve 560 is opened, and fluid can flow through piston 567 via opening 580 and chamber 484.Being sized to of opening 580 sets threshold value pressure reduction (by-passing valve 560 changes position under threshold value pressure reduction) and provides the enough by-passing valve 560 of fluid stream flows by opening, to guarantee that jet pump 500 provides the acceptable flowing of pressure fluid under operation with high pressure pattern.Piston 567 is biased to open position by spring 575.

In certain embodiments, by-pass line 555 has the small diameter in by-passing valve 560 upstream, and it is than little at the diameter at by-passing valve 560 place.This change forming station shoulder diametrically or seat, piston 567 keeps in the open position against shoulders or seat.As compared to the available fluid surface area on (Figure 12 with Figure 13) piston 567 surface when piston 567 is in the closed position, this shoulders decreases the available fluid surface area on piston 567 surface of (Fig. 9 and 10) backup pressurization secondary working fluid when piston 567 is in an open position.Relative to for keeping or maintaining piston 567 required pressure (i.e. " maintenance pressure ") in the closed position, this species diversity on the available fluid surface area on piston 567 surface contributes to increase makes piston 567 be displaced to the pressure needed for closed position (namely " blow and close pressure (blow-off pressure) ") from open position.That is, blow close pressure higher than maintenance pressure.In a preferred embodiment, blowing the ratio closing pressure and maintain pressure is 6:1.This is helpful for the pressure washer comprising idle mode, in this mode when water pump water pump speed when not using reduces.Once be switched to high throughput pattern from operation with high pressure pattern, the pressure Rapid Variable Design on piston 567 surface is enough to reach blow and closes pressure and make piston 567 move to closed position, even if for the pressure washer comprising idle mode.In a preferred embodiment, the external diameter of piston 567 is 0.484 inch, and the diameter (such as, the narrowed portion before shoulders) of the bypass pipe 555 of by-passing valve 560 upstream is 0.187 inch, and the diameter of opening 580 is 0.073 inch.

As shown in figs. 9 and 10, under operation with high pressure pattern, by pressurization secondary working fluid second (namely, stream in by-pass line 555) be applied to power on piston 567 upstream face by spring 575 be applied to power on piston 567 overcome, thus make piston 567 move to open position away from valve seat 570.As shown in figure 12 and figure 13, under high throughput pattern, by the second of pressurization secondary working fluid be applied to power on piston 567 upstream face by spring 575 be applied to power on piston 567 overcome, thus make piston 567 move to closed position against valve seat 570.In certain embodiments, when under high throughput pattern, close to make by-passing valve 560, the valid circulation area that opening 580 and current limiter 515 merge is less than the valid circulation area (such as, the valid circulation area of nozzle selected by pressure washer spray gun) of jet pump 500 lower exit.In the embodiment that some are substituting, by-passing valve 560 inputs manual operation (such as, by switch or rotating disk) by user.In these embodiments, manually operated by-passing valve is used between high flow capacity and operation with high pressure pattern and changes.In certain embodiments, by-passing valve can be two positions (such as, opening and closing) valve, and it comprises so that user's machinery input of being accessed by the user of jet pump 500 outside.In other embodiments, by-passing valve can by electric actuation (such as, magnetic valve) to opening or closing position and being biased to relative position, or by electric actuation to opening and closing position.The by-passing valve of electric actuation can by being positioned at each position (such as, on jet pump 500, on pressure washer, on spray gun etc.) the custom power input at place controls (such as, button, switch, touch pad, touch-screen or other suitable actuator).Custom power input can communicate via wire or wirelessly with the by-passing valve of electric actuation.Therefore, for comprising the embodiment of manual operation by-passing valve, the nozzle with certain valid circulation area can be used for using together with the spray gun of the pressure washer operated under high throughput pattern or operation with high pressure pattern.

As shown in figure 12 and figure 13, under high throughput pattern, the secondary working fluid of pressurization enters jet pump 500 via first fluid entrance 505.Pressurization Primary fluid flow enters in by-pass line 555 by secondary working fluid chamber 535, at by-pass line place, by second, the power be applied on piston 567 upstream face makes by-passing valve 560 move to closed position, thus closes by-pass line 555 and prevent pressurization Primary fluid flow by by-passing valve 560.

When by-passing valve 560 cuts out, the Primary fluid flow of pressurization by secondary working fluid chamber 535, and passes through secondary working fluid nozzle 510.Current limiter 515 is in following position, and the diameter of the passage in this position by secondary working fluid nozzle 510 is its minimum of a value.In certain embodiments, secondary working fluid nozzle 510 comprises the convergence portion of current limiter 515 upstream and the divergent portion in current limiter 515 downstream, in diameter constriction on the fluid flow direction towards current limiter 515 of convergent portion office passage, widen on fluid flow direction at the diameter of divergent portion place passage.In other embodiments, divergent portion is omitted and fluid leaves nozzle (as shown in Fig. 9-13) at current limiter 515 place.In certain embodiments, current limiter 515 limits looping pit.Pressurization secondary working fluid leaves secondary working fluid nozzle 510 and enters in mixing chamber 520.In certain embodiments, secondary working fluid nozzle 510 extends in mixing chamber.

Current limiter 515 is formed and leaves the high-speed jet that secondary working fluid nozzle 510 arrives the pressurization secondary working fluid of mixing chamber 520.Current limiter 515 converts pressure to speed.The high-speed jet of pressurization secondary working fluid forms vacuum or low-pressure area by Bernoulli Jacob or Venturi effect or both being combined in mixing chamber 520.Vacuum or low-pressure area and/or low-pressure area and via secondary fluid entrance 530 can secondary fluid between pressure reduction be enough to secondary fluid to be incorporated in mixing chamber 520 by secondary fluid entrance 530.In addition, check-valves 557 is opened.Once enter in mixing chamber 520, secondary fluid just carries by pressurization secondary working fluid the high volume fluid stream or the flowing that form merging secretly, and it significantly increases the volume of stream compared with the pressurization secondary working fluid of self.The high-speed jet of pressurization secondary working fluid contacts with the secondary fluid be introduced in mixing chamber 520, thus kinetic energy is delivered to secondary fluid.By this way, the secondary working fluid of pressurization carries secondary fluid secretly to form the high volumetric fluid flow or stream that merge.The high volume fluid of this merging flows out to leave jet pump 500 by fluid issuing 525 from mixing chamber 520.

As shown in Figure 11, outlet conduit 540 comprises the exit passageway 542 mixing chamber 520 fluid being connected to fluid issuing 525.The porch that outlet conduit 540 is leading to exit passageway 542 limits horn mouth or convergence portion 590.The diameter of horn mouth 590 reduces on fluid flow direction.The high volume fluid stream merged is directed in exit passageway 542 from mixing chamber 520 by horn mouth 590 effectively.Outlet conduit 540 also limits diffuser 595.The diameter of diffuser 595 increases on fluid flow direction.Rate conversion is become pressure by diffuser 595, thus flows through the pressure of the high volume fluid stream increasing merging before fluid issuing 525 leaves jet pump 500 at fluid and reduce its speed.

End difference 545 has the minimum diameter of exit passageway 542.Exit passageway 542 is greater than the diameter at end difference 545 place at the diameter (such as, the diameter of exit portion) in end difference 545 downstream.One or more hole or opening 600 (such as, around multiple openings of the circumference of exit passageway 542) extend to exit passageway 542 from annular compartment 550.Opening 600 is positioned at the downstream of end difference 545.Exit passageway 542 contribute to the turbulent flow that makes to be caused by the second of the pressure fluid being entered exit passageway 542 by opening 600 under operation with high pressure pattern or other minimum interference at the increase diameter in end difference 545 downstream.End difference 545 is built into the Venturi tube being suitable for chemicals and injecting, as will be described in more detail below in.In addition, end difference 545 produces Venturi effect under high throughput pattern, and when from operation with high pressure Mode change to high throughput, is believed to be helpful in makes piston 567 move to closed position at the low-pressure area in end difference downstream.

With reference to Figure 12, chemical inlet 565 allows chemicals (such as, soap, glazing agent, clear spot irrigation, herbicide, washing agent etc.) to be added to the high volume fluid stream of merging.Chemical inlet 565 fluid is connected to chemical container, source or holder.In certain embodiments, as shown in fig. 1, chemical container 566 is the parts of pressure washer 110 and is connected to chemical inlet 565 by supply line 568 fluid.In other embodiments, chemical container is connected to spray gun (such as, spray gun 700,740, the chemical container 720 of 750).Chemical inlet 565 is also connected to annular compartment 550 via chemicals passage 569 fluid be formed in valve seat 570.Check-valves 571 optionally cuts out chemical inlet 565.When there is enough pressure reduction by check-valves 571 (such as between annular compartment 550 and chemical container), check-valves 571 is biased to the closed position and open position.In certain embodiments, chemical inlet 565 fluid is connected to the by-pass line 555 in by-passing valve 560 downstream.When the back pressure on jet pump 500 is lower than chemicals threshold pressure, end difference 545 is used as Venturi tube, and forms low-pressure area in the downstream of end difference 545.This low-pressure area is enough to open check-valves 571, and by chemicals chemically product container be drawn in annular compartment 550 by chemical inlet 565, be drawn in exit passageway 542 by opening 600, be added to the high volume fluid stream of merging at exit passageway place chemicals.When the back pressure in jet pump place 500 is higher than chemicals threshold pressure, do not formed low-pressure area and not chemically product container suction chemicals.In some embodiments, (such as, as shown in fig. 1), chemical flow control valve 572 fluid between chemical container 566 and chemical inlet 565 of on/off connects.In certain embodiments, current limiter or other metering device fluid between chemical container and chemical inlet 565 connects.In certain embodiments, one or more additional chemical container comprises the chemicals different from the first holder.User selects between containers by activating the selector fluid of container being connected to suitable supply line.Additional container can be connected to the parts of spray gun or pressure washer.In certain embodiments, chemicals threshold pressure is 350psi.In other embodiments, chemicals threshold pressure is different (such as, 300psi, 325psi, 375psi, etc.).The concentration of the active component in chemicals may need optimised so that compatible with high throughput pattern, with realize as in traditional chemical product injected system the identical output concentration of the chemicals that finds and water.An advantage of jet pump 500 is that user can be come in different operator schemes (such as by the back pressure changed at place of jet pump place 500, operation with high pressure pattern, there is no the high throughput pattern of chemicals, there is the high throughput pattern of chemicals) between easily switch.Valid circulation area (change the position of turntable type nozzle, change each nozzle, regulate variable-nozzle, change spray gun, regulate the current limiter etc. in jet pump downstream) by changing spray gun changes back pressure.User switches between different spray patterns and output fluid stream by changing selected nozzle (or regulate variable-nozzle or change spray gun) simply.Such as, high pressure nozzle (such as, the fan nozzle of 0 ° of nozzle or 25 °) can be selected for high-pressure Cleaning application, as clean side, and high-flow nozzles (add or do not add chemicals) can be selected for high flow capacity task, as clean second floor window or carwash.User can start and stops fluid flowing and change nozzle directly to switch between task in spray gun to select suitable operation and chemicals pattern by use traffic control valve as required, and need not change at the main body place of pressure washer.This can be reduced at the process carrying out between task changing, and shortens the time required for switching between task (such as, pressure wash, rinsing, rinses, with soap lye, clear spot rinsing etc.).

With reference to Figure 14-16, the spray gun 700,740 and 750 for using together with pressure washer is shown.Each spray gun 700,740 and 750 comprises by trigger 710 control valve for fluids that (or input unit of other user actuating) activates and turntable 715 activates or flow control valve 705, and jet pump 500.Time in the open position, flow control valve 705 allows fluid to leave spray gun, and time in a closed position, anti-fluid leaves spray gun.Turntable 715 comprises multiple nozzle, and each nozzle structure becomes to provide different spray patterns or output fluid flow.The rotatable turntable of user 715 one of to be selected in multiple nozzle to use.When spray gun 700 fluid is connected to outlet (such as, fluid issuing 525) of pressure washer, the valid circulation area of selected nozzle produces back pressure at place of jet pump place 500.As mentioned above, back pressure at this jet pump 500 place controls jet pump 500 and is in high throughput pattern or is in operation with high pressure pattern, and under high throughput pattern, controls chemicals be added and still do not add.

Such as, in certain embodiments, turntable 715 comprises first jet 716, second nozzle 717 and the 3rd nozzle 718, first jet 716 has the first valid circulation area forming relatively high back pressure at place of jet pump place 500, thus realize operation with high pressure pattern, second nozzle 717 has at second valid circulation area that be greater than first valid circulation area of place of jet pump place 500 formation higher than the relatively low back pressure of chemicals threshold pressure, thus realize high throughput pattern, and do not allow chemicals to add in the high volume fluid stream of merging, 3rd nozzle 718 has at three valid circulation area that be greater than second valid circulation area of place of jet pump place 500 formation lower than the relatively low back pressure of chemicals threshold pressure, thus realize high throughput pattern, and chemicals is added in the high volume fluid stream of merging.Turntable 715 allows user to switch between different spray patterns and output fluid flow by changing selected nozzle simply.Such as, high pressure nozzle (such as, the fan nozzle of 0 ° of nozzle or 25 °) can be selected for high-pressure Cleaning application, as clean side, and high-flow nozzles (add or do not add chemicals) can be selected for high flow capacity task, as clean second floor window or carwash.User can start and stops fluid flowing and use turntable 715 to come directly to be between task at spray gun 700 to switch to select suitable operation and chemicals pattern by use traffic control valve 705 as required.

In certain embodiments, turntable 715 is replaced by fluid issuing, and fluid issuing has joint, and it once can receive a dismountable nozzle (such as, being similar to spray gun 118 described above and nozzle 265 and 270).By changing selected nozzle simply, just as use turntable 715, multiple dismountable nozzle is used between different jet modes and output fluid flow and switches, and wherein each dismountable nozzle has different valid circulation area.

Chemical container 720 is fixed to the main body of spray gun 700, and is connected to jet pump 500 at chemical inlet 565 place fluid.In certain embodiments, chemical container 720 is detachably fixed to the main body of spray gun 700, and such chemical container can be disassembled as required and recharge or change.

As shown in figs. 15 and 16, jet pump 500 can be positioned at the upstream of flow control valve 705.Flow control valve 705 is designed to process the fluid be associated with high pressure and high throughput pattern and exports.As shown in Figure 15, jet pump 500 is removably attached to the body of spray gun 740.As shown in Figure 16, jet pump 500 accessible site is in spray gun 750.

As shown in Figure 14, jet pump 500 to be integrated in spray gun 700 and to be positioned at the downstream of flow control valve 705, and such flow control valve 705 controls the flow flowing to the pressurization secondary working fluid of jet pump 500 fluid intake 505.The maximum fluid that flow control valve 705 is designed to processing pressure cleaning machine exports.In these embodiments, spray gun 700 also comprises pressure relief valve 721 or other stop valve, flows out spray gun, even if when flow control valve 705 is closed to prevent secondary fluid.Pressure relief valve 721 is configured to higher than typical pressure of supply water (such as, open under threshold pressure (such as 100psi) 30psi), and close under lower than the pressure of threshold pressure, constantly flow out from spray gun 700 to prevent secondary fluid.

With reference to Figure 14-16, the primary fluid inlet 505 of jet pump 500 is connected to the outlet of pressure washer (such as by high-pressure hose or pipeline 725 fluid, fluid issuing 525), and secondary fluid entrance 530 by low-pressure hose or pipeline 730 (such as, garden hoses) fluid is connected to water source (such as, being connected to the sleeve pipe of municipal water supplies or well).Wherein in some substituting embodiments of using together with garden hoses pressure charging system of jet pump 500 (such as, be that on March 25th, 2009 submits to and as US2010/0243086 announcement application number is 12/411, pressurized water sprinkling system described in the U. S. application of 139, be that on July 14th, 2009 submits to and as US 8, 439, 651 application numbers of authorizing are 12/502, garden hoses booster water pump system described in the U. S. application of 798, and be that on May 25th, 2010 submits to and as US2011/0290827 announcement application number is 12/787, the garden hoses pressure charging system of 282, all these applications are incorporated to herein in full by reference with it), the primary fluid inlet 505 of jet pump 500 by low-pressure hose or pipeline (such as, garden hoses) fluid is connected to the outlet of garden hoses pressure charging system, and secondary fluid entrance 530 by low-pressure hose or pipeline (such as, garden hoses) fluid is connected to water source (being such as connected to the sleeve pipe of municipal water supplies or well).Flexible pipe 725 and 730 can be attached to one another (such as, by fixture, band, frenulum etc., or co-molded, jointly extrude or be otherwise formed as having the single flexible pipe in two flow channels or path).Secondary fluid is fed to jet pump 500 and secondary working fluid is fed to the water pump (as water pump 116) of pressure washer by water source.Such as, three-way connection can be arranged on the porch leading to water pump, and the water like this from water source can be supplied to water pump and secondary fluid entrance 530.In certain embodiments, spray gun 700 also comprises second or low pressure trigger, its flow control valve activating the second on/off exports (such as secondary fluid flexible pipe fluid to be connected to fluid, nozzle selected on turntable 715), to be provided for the secondary fluid stream (such as, " garden hoses " stream) of low pressure and low discharge task.

With reference to Figure 17-18, spray gun 760 is shown.Spray gun 760 comprises adjustable or variable-nozzle 719, for changing the valid circulation area of spray gun instead of multiple nozzle as illustrated in figures 14-16.As shown in Figure 17, in the first structure of variable-nozzle 719, valid circulation area is relatively large, and realizes high throughput pattern.As shown in Figure 18, in the second structure of variable-nozzle 719, valid circulation area is relatively little, and realizes operation with high pressure pattern.In certain embodiments, variable-nozzle 719 is infinite variable.In certain embodiments, variable-nozzle 719 has multiple predeterminated position corresponding to different valid circulation area.

As shown in Fig. 9-13 and 19, jet pump 500 also can be integrated with water pump 116.Primary fluid inlet 505 is fixed to pump discharge 130.Such as, as shown in Figure 19, threaded connection 800 is screwed in pump discharge 130, and grip fastener 805 (such as, self tapping fishbolt) provides radial clamping load.As shown in Figure 9, O shape ring or packing ring 810 are sealed in the connecting portion between fluid intake 505 and pump discharge 130.Three-way connection 815 comprises the secondary working fluid pipeline 820 being fixed to pump intake 128 and the secondary fluid pipeline 825 being fixed to secondary fluid entrance 530.Such as, secondary working fluid pipeline 820 is fixed to pump intake 128 by being similar to for primary fluid inlet 505 being fixed to those threaded connection 800, grip fastener 805 and O shape ring 810 of pump discharge 130.Such as, as shown in Figure 19, secondary fluid pipeline 825 is fixed to secondary fluid entrance 530 by bamp joint 830 and securing member 835 (such as, tapping screw).As shown in Figure 9, O shape ring or packing ring 840 seal the connecting portion between secondary fluid pipeline 825 and secondary fluid entrance 530.Three-way connection 815 also comprises the entrance 816 being configured to be connected to fluid source.In certain embodiments, entrance 816 comprises garden hoses or other low-pressure connector.

In certain embodiments, public or shared pump case encapsulation jet pump 500 and the pump machanism of water pump 116.In certain embodiments, this pump case comprises the mounting structure for water pump 116 being attached to prime mover.In certain embodiments, (such as, cylinder or the piston body at least partially of jet pump 500 and water pump 116 pumping mechanism, housing, crankcase etc.) be formed as single (such as, one, overall) parts (such as, single foundry goods).With water pump (such as, water pump 116) be " one " or " integrated " to the flow multiplier (such as jet pump 500) of water pump be single global facility, wherein flow multiplier and water pump share encapsulating flow multiplier and water pump pumps mechanism public housing and/or wherein flow multiplier and water pump pumping mechanism at least partially (such as, cylinder or piston body, housing, crankcase etc.) be formed as single (such as, one, overall) parts (such as, be formed as single foundry goods, be formed as single moulding part, etc.).

With reference to Figure 20, the electric press cleaning machine 900 according to exemplary embodiment is shown.Jet pump 500 is integrated to form flow multiplier and water pump component 905 with water pump 116.In the illustrated embodiment, flow multiplier and water pump component are the internal parts of the electric press cleaning machine 900 of the housing 910 being positioned at electric press cleaning machine 900 completely, are therefore sightless for user during the normal operating of pressure washer.In certain embodiments, flow multiplier and water pump component 905 can be the external component of electric press cleaning machine 900 (such as, be positioned at outside or the outside of housing 910 completely, thus be visible for user during the normal operating of pressure washer).In other embodiments, at least partially (such as, one or more primary fluid inlet 505, fluid issuing 525, secondary fluid entrance 530 and chemical inlet 565 are at least partially) extend through housing 910, and be visible for user during the normal operating of pressure washer.Electric press cleaning machine 900 also comprises as the electro-motor 915 of prime mover and the power line 920 for supplying power to electro-motor 915.Actuator (such as, switch, button, touch pad, touch-screen, or other suitable user input apparatus) can be activated to activate by user or inactive electro-motor 915 activating thus or inactive flow multiplier and water pump component 905.In certain embodiments, stream flow multiplier and water pump component 905 are internal parts (such as, being positioned at housing or the guard shield of Pneumatic pressure cleaning machine) of Pneumatic pressure cleaning machine.Flow multiplier and water pump component 905 can be considered to the single water pump comprising jet pump 500 and main pumping mechanism (such as, water pump 116).This single water pump can be used for the pump (such as, variable delivery pump, variable stroke pump, speed-variable pump etc.) replacing other type that can provide change flow rate.

As shown in Figure 21, in certain embodiments, jet pump 500 can be the external component of pressure washer 1000, and during the normal operating of pressure washer, jet pump is visible for user like this.Flow multiplier can be the parts of the pressure washer 1000 sold by manufacturer.Jet pump 500 also can after a while by user installation on pressure washer 1000.By this way, existing pressure washer can be changed over the pressure washer that high flow capacity and operation with high pressure pattern and chemicals can be provided to inject by user.Therefore, jet pump 500 can be attached to pressure washer 1000 and disassemble from pressure washer.

In certain embodiments, jet pump 500 is integrated into the output channel or the flexible pipe that pump discharge (such as, pump discharge 130) fluid are connected to spray gun.

When jet pump 500 is not fixed to spray gun (such as, pressure washer 900 and 1000), single delivery hose or the pipeline with single fluid passage or path can be used for fluid issuing 525 fluid to be connected to spray gun.Preferably, this delivery hose is designed to handle high voltages and high throughput pattern (such as, high-pressure hose provides the enough flows being suitable for high throughput pattern).

Jet pump 500 can with pressure washer distribution, to allow user existing pressure washer changed over the pressure washer that high flow capacity and operation with high pressure pattern and chemicals can be provided to inject.Jet pump 500 can be sold separately or parts as kit utility are sold, kit utility comprises jet pump 500, spray gun (such as spray gun 700) and for jet pump 500 fluid being connected to spray gun or any flexible pipe be connected to by pressure washer fluid needed for jet pump 500 or pipeline.User can use this kit utility so that by the primary fluid inlet 505 of jet pump 500 is connected to water pump 116 (such as, by pipeline or flexible pipe, directly connect) pump discharge 130, the secondary fluid entrance 530 of jet pump 500 is connected to the supply line or flexible pipe that are configured to be connected to fluid source and fluid issuing 525 is connected to output channel or flexible pipe or be connected to spray gun (such as spray gun 740 and 760) and by standard or the pressure washer of routine be transformed into changeable flow pressure washer.The main body that jet pump 500 can also be connected to pressure washer by user (such as, is connected to water pump 116, is connected to framework 112, be connected to substrate 122, be connected to prime mover 114, etc.), or be connected to spray gun (such as spray gun 740 and 760).Three-way connection 815 can be included in kit utility, makes common flow body source be connected to the pump intake 128 of secondary fluid entrance 530 and water pump 116.

Jet pump 500 is suitable for using together with Pneumatic pressure cleaning machine (that is, having the pressure washer of the explosive motor as prime mover) and be suitable for use together with electric press cleaning machine (namely having the pressure washer of the electro-motor as prime mover).Pneumatic pressure cleaning machine has the higher specified output (such as, in available pressure and/or flow rate) higher than electric press cleaning machine usually.Jet pump 500 authorized pressure cleaning machine provide cannot alternate manner separately from the high throughput pattern that the pressure washer of standard or routine obtains.Under bottom line, the rated pressure of pressure washer is 100psi.The rated pressure of pressure washer can up to 4000psi and more than.Such as, for the Pneumatic pressure cleaning machine that rated pressure under 2.7gpm is 3000psi, jet pump 500 produces the high throughput pattern of 400psi under may be provided in 5gpm.For the electric press cleaning machine that rated pressure under 1.3gpm is 1700psi, jet pump 500 produces the high throughput pattern of 175psi under may be provided in 4.7gpm.Jet pump 500 makes the flow rate of Pneumatic pressure cleaning machine approximately double, and makes the flow of electric press cleaning machine approximately increase by three times.

With reference to figure 3A, in certain embodiments, pressure washer can comprise source pressure meter 1205.Source pressure meter 1205 fluid is connected to secondary flow body source, whether has enough secondary fluid pressure to provide enough second fluids successfully to realize high throughput pattern to indicate at secondary fluid entrance 230 place.When secondary fluid pressure too low (such as, lower than threshold value), then secondary flow body source can not provide enough secondary fluid to keep the demand of high throughput pattern down-off multiplier 200.Such as, when using the well with low line pressure, as during secondary flow body source, above-mentioned situation can occur.The instruction (such as, light, message, sub-audible sound or the appreciable indicator of other user) that source pressure meter 1205 provides secondary fluid pressure to be enough to be allowed for high throughput pattern to user.

In certain embodiments, pressure washer comprises framework, the prime mover in Power output portion is comprised by frame supported, be connected to Power output portion and comprise the water pump of pump intake and pump discharge, fluid is connected to pump intake and is configured to be connected to the supply line of secondary working fluid supply department, comprise the flow multiplier of the mixing chamber with fluid issuing, fluid is connected to the primary fluid inlet of pump discharge, at the elementary current limiter in primary fluid inlet downstream, the secondary working fluid nozzle of elementary downstream, to extend in mixing chamber and there is the secondary working fluid nozzle of the jet expansion being positioned at mixing chamber, and the secondary fluid entrance to be communicated with mixing chamber fluid, fluid is connected to the secondary fluid pipeline of supply line and secondary fluid entrance, the check-valves of secondary fluid inlet upstream is positioned at along secondary fluid pipeline, check-valves is configured to cut out secondary fluid pipeline in response to the mixing chamber's pressure higher than threshold pressure, fluid is connected to the conveyance conduit of fluid issuing, and fluid is connected to the spray gun of the conveyance conduit in fluid issuing downstream, spray gun comprises at least two nozzles, there is the first jet of the first circulation area and there is the second nozzle of the second circulation area being greater than the first circulation area, fluid is by leaving spray gun one of at least two nozzles.Under operation with high pressure pattern, secondary working fluid flow to water pump from primary fluid source by supply line, pressurized in water pump, leave water pump, enter flow multiplier by primary fluid inlet, secondary working fluid nozzle is arrived by elementary current limiter, leaving secondary working fluid jet expansion enters in mixing chamber, leaves mixing chamber, arrive spray gun by conveyance conduit by fluid issuing, and leave spray gun by first jet, thus mixing chamber's pressure is made to exceed threshold pressure.Under high throughput pattern, secondary working fluid flow to water pump by supply line from primary fluid source, pressurized in water pump, leave water pump, flow multiplier is entered by primary fluid inlet, secondary working fluid nozzle is arrived by elementary current limiter, and leave secondary working fluid jet expansion and enter in mixing chamber, and secondary fluid flows out from supply line, pass through check-valves, and enter in mixing chamber by secondary fluid entrance, secondary fluid is carried secretly by secondary working fluid, result through merging fluid that fluid issuing leaves mixing chamber to flow through conveyance conduit and arrive spray gun, and leave spray gun by second nozzle, thus keep mixing chamber's pressure lower than threshold pressure.

As the equipment as shown in each exemplary embodiment, system and method structure and arrange be only exemplary.Although described only several embodiment in the disclosure in detail, many amendments (change such as, on following: the size of various element, dimension, structure, shape and ratio, parameter value, mounting arrangements, the use of material, color, orientation etc.) be possible.Such as, being depicted as some elements be integrally formed can be made up of multiple parts or element, and the position of element can put upside down or otherwise change, and the character of discrete elements or position or quantity can change or change.Therefore, all this kind of amendment intentions are included within the scope of the present disclosure.Order or the order of any process or method step can carry out changing or resequencing according to an alternative embodiment.Also can carry out other to replace when not departing from disclosure scope, revise, change and omit in the design of exemplary embodiment, operating condition and layout.

The disclosure can be susceptible to method, system and the program product on any machine readable media for completing various operation.Embodiment of the present disclosure can use existing computer processor to implement, or is implemented by the computer processor of the special-purpose be incorporated to for this or other object being suitable for suitable system, or is implemented by rigid line system.Embodiment within the scope of the disclosure can comprise program product, and it comprises the machine readable media for being loaded with or having machine-executable instruction or the data structure be stored thereon.This machine readable media can be any available medium, and it can be accessed by the computer of general object or special object or other machine with processor.By the mode of example, this machine-readable medium can comprise RAM, ROM, EPROM, EEPROM, CD-ROM or other disk storage, magnetic disc store or other magnetic storage apparatus, or other medium any, medium can be used for being loaded with or storing the required program code for machine-executable instruction or data structure and it can be accessed by the computer of general object or special object or other machine with processor.When being transmitted by network or another communication connection (hardwired, wireless, or hardwired or wireless combination) of being connected to machine or providing information, this connection is suitably considered as machine readable media by machine.Therefore, any connection is like this properly termed machine readable media.Combination every is above also included within the scope of machine readable media.The executable instruction of machine such as comprises following instruction and data, and it causes the handling machine of general object computer, special object computer or special object to perform specific function or function group.

Although accompanying drawing may illustrate the particular order of method step, each sequence of steps can be different from shown sequence of steps.In addition, two or more step can or partly be carried out simultaneously simultaneously.This change will depend on various factors, comprise selected software and hardware system and depend on the selection of designer.All these change all within the scope of the present disclosure.Similarly, the programming technique of available standards completes Software Implementation of the present invention, and above-mentioned technology has the rule of logic-based and other logic to complete various different Connection Steps, treatment step, comparison step and deciding step.

Claims

1. a pressure washer, it comprises:

Prime mover;

Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And

Spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area;

Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

2. pressure washer according to claim 1, wherein, described spray gun comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

3. pressure washer according to claim 2, wherein, multiple nozzle is formed in turntable.

4. pressure washer according to claim 1, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

5. pressure washer according to claim 1, wherein, described jet pump also comprises:

Mixing chamber, its fluid between nozzle and fluid issuing connects and fluid is connected to secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes pressurization secondary working fluid flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line;

Wherein said pass valve configuration becomes to move between open and closed positions in response to the back pressure at jet pump place;

Wherein under first back pressure at described jet pump place, during by-passing valve is in an open position; And

Wherein under second back pressure at described jet pump place, during by-passing valve is in the closed position.

6. pressure washer according to claim 1, also comprises:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under the first pressure of the fluid flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

7. pressure washer according to claim 6, wherein, described chemicals source is fixed to spray gun.

8. pressure washer according to claim 6, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

9. pressure washer according to claim 6, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

10. pressure washer according to claim 6, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

11. pressure washers according to claim 1, wherein, described jet pump is attached to water pump.

12. pressure washers according to claim 1, wherein, described jet pump is incorporated in spray gun.

13. pressure washers according to claim 12, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the upstream of flow control valve.

14. pressure washers according to claim 13, also comprise:

Pump discharge fluid is connected to the pressure piping of primary fluid inlet.

15. pressure washers according to claim 12, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

16. pressure washers according to claim 15, also comprise:

17. 1 kinds of electric press cleaning machines, it comprises:

Electro-motor;

For supplying power to the power line of electro-motor;

Be connected to the water pump of electro-motor, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

18. electric press cleaning machines according to claim 17, wherein, described spray gun also comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

19. electric press cleaning machines according to claim 18, wherein, multiple nozzle is formed in turntable.

20. electric press cleaning machines according to claim 17, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

21. pressure washers according to claim 17, wherein, described jet pump also comprises:

22. electric press cleaning machines according to claim 17, also comprise:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

23. electric press cleaning machines according to claim 17, wherein, described jet pump is attached to water pump.

24. electric press cleaning machines according to claim 17, wherein, described jet pump is incorporated in spray gun.

25. electric press cleaning machines according to claim 24, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the upstream of flow control valve.

26. electric press cleaning machines according to claim 24, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

27. 1 kinds of pressure washers, it comprises:

Prime mover;

Jet pump, it comprises:

Fluid is connected to the primary fluid inlet of pump discharge;

Be configured to the secondary fluid entrance being connected to fluid source, and fluid issuing;

By-pass line, its fluid is connected to pump discharge and described mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line; And

Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump;

Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid;

Wherein, under operation with high pressure pattern, during described by-passing valve is in an open position and the Primary fluid flow of pressurization arrive the fluid issuing of jet pump by nozzle and bypass flow path; And

Wherein, under the operator scheme of high flow capacity, during by-passing valve is in the closed position.

28. pressure washers according to claim 27, wherein, the current limiter of described nozzle limits looping pit.

29. pressure washers according to claim 27, wherein, described by-passing valve comprises:

Valve seat;

Can the piston of movement between open and closed positions, wherein described piston does not engage with valve seat in the open position, thus allow the fluid of pressurization to flow through described by-passing valve, wherein described piston engages with valve seat in a closed position, thus prevents the fluid pressurizeed from flowing through described by-passing valve; And

Piston is biased to the spring of open position.

30. pressure washers according to claim 29, wherein, described piston comprises:

Chamber, its be sized to when piston in the closed position middle time receive valve seat; And

Lead to the opening of chamber, wherein when piston in an open position middle time pressurization fluid flow through opening arrive chamber.

31. 1 kinds of water pumps, it comprises:

For the pumping mechanism of the secondary working fluid stream that pressurizes, pumping mechanism comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; And

Wherein, in operation, under first back pressure at jet pump place, realize operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, under the second back pressure that jet pump place is less than the first back pressure, realize high throughput pattern, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

32. water pumps according to claim 31, also comprise:

Encapsulate the pump case of described pumping mechanism and jet pump.

33. water pumps according to claim 32, wherein, described pump case comprises the mounting structure for water pump being attached to prime mover.

34. water pumps according to claim 31, wherein, described jet pump and pumping mechanism be formed as single parts at least partially.

35. water pumps according to claim 31, wherein, described single parts are castings.

36. water pumps according to claim 31, wherein, described pumping mechanism can produce the secondary working fluid of the pressurization of at least 500psi.

37. water pumps according to claim 31, wherein, described pumping mechanism can produce the secondary working fluid of the pressurization of at least 1000psi.

38. water pumps according to claim 31, wherein, described jet pump also comprises:

39. according to water pump according to claim 38, and wherein, described jet pump also comprises:

Wherein said end difference is configured to Venturi tube, make under fluid first pressure flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

40. water pumps according to claim 31, wherein, described jet pump also comprises:

41. water pumps according to claim 40, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

42. water pumps according to claim 40, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

43. water pumps according to claim 40, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

44. water pumps according to claim 31, wherein, described jet pump also comprises:

Wherein under operation with high pressure pattern, during described by-passing valve is in an open position, and pressurization Primary fluid flow arrives the fluid issuing of jet pump by nozzle and bypass flow path; And

Wherein under high throughput pattern, during by-passing valve is in the closed position, and the Primary fluid flow of pressurization passes through nozzle, make the pressurization secondary working fluid leaving nozzle arrival mixing chamber carry the secondary fluid being fed to mixing chamber by secondary fluid entrance secretly, cause the fluid stream flowing through the secondary working fluid of jet pump fluid issuing and the merging of secondary fluid.

45. water pumps according to claim 44, wherein, the current limiter of described nozzle limits looping pit.

46. water pumps according to claim 44, wherein, described by-passing valve comprises:

Valve seat;

Piston is biased to the spring of open position.

47. water pumps according to claim 46, wherein, described piston comprises:

48. 1 kinds of jet pumps, it comprises;

Be configured to the primary fluid inlet that fluid is connected to the primary fluid source of pressurization;

Be configured to the secondary fluid entrance being fluidly connected to secondary flow body source;

Fluid issuing;

Have the nozzle of current limiter, wherein said nozzle fluid between primary fluid inlet and fluid issuing connects, to make the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to mixing chamber to provide the bypass flow path walking around described nozzle; And

Wherein said pass valve configuration becomes to move between described open position and described closed position in response to the back pressure at jet pump place;

Wherein, under first back pressure at jet pump place, during by-passing valve is in an open position; And

Be less than the second back pressure of described first back pressure at jet pump place under, by-passing valve is in cut out.

49. jet pumps according to claim 48, also comprise:

50. jet pumps according to claim 49, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

51. jet pumps according to claim 49, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

52. jet pumps according to claim 49, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

53. jet pumps according to claim 48, wherein, the current limiter of described nozzle limits looping pit.

54. jet pumps according to claim 48, wherein, described by-passing valve comprises:

Valve seat;

Piston is biased to the spring of open position.

55. jet pumps according to claim 54, wherein, described piston comprises:

56. 1 kinds of jet pump kit utilitys for using together with water pump, it comprises:

Jet pump, described jet pump comprises and is configured to fluid and is connected to the pump discharge of water pump to receive the primary fluid inlet of secondary working fluid of pressurization, is configured to fluid and is connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing; And

Spray gun, described spray gun comprises the lance outlet with variable valid circulation area.

57. jet pump kit utilitys according to claim 56, also comprise:

The fluid issuing of jet pump is connected to the pressure piping of spray gun.

58. jet pump kit utilitys according to claim 56, wherein, described spray gun also comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

59. jet pump kit utilitys according to claim 56, wherein, multiple nozzle is formed in turntable.

60. jet pump kit utilitys according to claim 56, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

61. jet pump kit utilitys according to claim 56, wherein, described jet pump and spray gun are independent parts.

62. jet pump kit utilitys according to claim 45, wherein, described jet pump is incorporated in spray gun.

63. jet pump kit utilitys according to claim 62, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is in the upstream of flow control valve.

64. jet pump kit utilitys according to claim 63, also comprise:

For primary fluid inlet fluid being connected to the pressure piping of pump discharge; And

For secondary fluid inlet fluid being connected to the high flow capacity pipeline of secondary fluid supply department.

65. jet pump kit utilitys according to claim 64, wherein, described pressure piping and high flow capacity pipeline are attached to one another.

66. jet pump kit utilitys according to claim 62, wherein, described spray gun also comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

67. jet pump kit utilitys according to claim 66, also comprise:

68. jet pump kit utilitys according to claim 67, wherein, described pressure piping and high flow capacity pipeline are attached to one another.

69. jet pump kit utilitys according to claim 66, wherein, described spray gun also comprises check-valves, with convenient flow control valve in the closed position middle time prevent secondary fluid from the flowing of jet pump.

70. 1 kinds of jet pump kit utilitys for using together with water pump, it comprises:

Jet pump, described jet pump comprises and is configured to the pump discharge that fluid is connected to water pump, to receive the primary fluid inlet of the secondary working fluid of pressurization, is configured to fluid and is connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing;

First spray gun, described first spray gun comprises the lance outlet with the first valid circulation area; And

Second spray gun, described second spray gun comprises the lance outlet with the second valid circulation area being greater than the first valid circulation area.

71. jet pump kit utilitys according to claim 70, also comprise:

For the fluid issuing of jet pump being connected to the pressure piping of spray gun.

72. 1 kinds of spray guns, it comprises:

There is the lance outlet of variable valid circulation area;

Flow control valve, its allow in the open position fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Jet pump, it comprises and is configured to the pump discharge that fluid is connected to water pump, to receive the primary fluid inlet of the secondary working fluid of pressurization, is configured to fluid and is connected to secondary fluid supply department to receive the secondary fluid entrance of secondary fluid, and fluid issuing.

73., according to the spray gun described in claim 72, also comprise:

For changing multiple nozzles of valid circulation area, wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

74. according to the spray gun described in claim 73, and wherein, multiple nozzle is formed in turntable.

75., according to the spray gun described in claim 72, also comprise:

For changing the adjustable nozzle of valid circulation area, wherein said adjustable nozzle is removable to change valid circulation area.

76. according to the spray gun described in claim 72, and wherein, the fluid issuing of described jet pump is positioned at the upstream of flow control valve.

77. according to the spray gun described in claim 72, and wherein, the fluid issuing of described jet pump is positioned at the downstream of flow control valve.

78. according to the spray gun described in claim 77, wherein, also comprises:

Check-valves, when flow control valve in the closed position middle time prevent secondary fluid from flowing out from spray gun.

79. 1 kinds of pressure washers, it comprises:

Prime mover;

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing;

First spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the first spray gun has the first valid circulation area; And

Second spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the second spray gun has the second valid circulation area being greater than the first valid circulation area;

Wherein, in operation, when the first spray gun fluid is connected to fluid issuing, first valid circulation area produces the first back pressure at jet pump place, thus realizing operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, when the second spray gun fluid is connected to fluid issuing, the second larger valid circulation area of lance outlet produces the second back pressure of the first back pressure be less than at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

80. according to the pressure washer described in claim 79, and wherein, described jet pump also comprises:

Under second back pressure at jet pump place, during by-passing valve is in the closed position.

81., according to the pressure washer described in claim 79, also comprise:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

In the upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

82. pressure washers according to Claim 8 described in 1, wherein, described chemicals source is fixed to spray gun.

83. pressure washers according to Claim 8 described in 1, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

84. pressure washers according to Claim 8 described in 1, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

85. pressure washers according to Claim 8 described in 1, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

86. according to the pressure washer described in claim 79, and wherein, described jet pump is attached to water pump.

87. pressure washers according to claim 1, wherein, described jet pump is incorporated in the first spray gun and the second jet pump is incorporated in the second spray gun.

88. 1 kinds change the method for flowing in response to back pressure, and described method comprises:

Pressure fluid is supplied to jet pump;

The first back pressure is formed at jet pump place;

Realize operation with high pressure pattern in response to the first back pressure, the fluid pressurizeed under this operation with high pressure pattern flows through jet pump;

Form the second back pressure at jet pump place, wherein said second back pressure is less than the first back pressure; And

Realize high throughput pattern in response to described second back pressure, the fluid pressurizeed under this high throughput pattern flows through jet pump and carries secondary fluid secretly, to cause the fluid stream of the merging of flowing out jet pump.

89. methods according to Claim 8 described in 8, characterized by further comprising:

Fluid source fluid is connected to jet pump, wherein from fluid source drawing pressurized fluid and secondary fluid.

90. methods according to Claim 8 described in 8, also comprise:

Form the 3rd back pressure at jet pump place, wherein said 3rd back pressure is less than described second back pressure;

High flow capacity and chemicals implant operation pattern is realized in response to described 3rd back pressure, the fluid pressurizeed under this high flow capacity and chemicals implant operation pattern flows through jet pump and carries secondary fluid secretly, cause the fluid stream of the merging of flowing out jet pump, and chemicals to be added to the fluid stream of merging in response to Venturi effect.

91. methods according to Claim 8 described in 8, also comprise:

Under operation with high pressure pattern, described pressure fluid is flowed by main flow path and the bypass flow path by jet pump; And

Under high volume operator scheme, pressure fluid is caused only to flow through main flow path.

92., according to the method described in claim 91, also comprise:

Under high throughput pattern, close bypass flow path in response to the second back pressure by by-passing valve.

93. methods according to Claim 8 described in 8, wherein, the fluid stream of merging has higher flow compared with pressure fluid and lower pressure.